Process for making autogenous joints.



' which would not be the case if the copper UNITED STATES PATENT OFFICE.

BRUCE FORD, 0F PHILADELPHIA, PENNSYLVANIA.

PROCESS FOR MAKING AUTOG-ENOUS JOINTS.

N 0 Drawing.

Another object of the invention is to provide for casting the leadterminals upon copper wires and bars, such as are used in storagebattery connections.

The process consists in first amalgamating the copper with mercury, thenplacing the amalgamated metal in a mold and casting the lead upon it.The mercury is either volatilized or absorbed by the lead, so that itseflect is negligible except that it makes an integral union between thelead and copper,

were not previously amalgamated. In other words, when lead is cast uponcopper the union is not satisfactory, but by amalgamat ing the copperand then casting the lead upon it the union is satisfactory and themercury does not seem to produce any effect other than bringing aboutthe closeness or perfectness of this union.

A convenient method of amalgamating the copper is to first moisten itwith an aqueous solution of caustic such as caustic soda and to then dipit into the mercury. A vessel containing mercury to the required depthwith a solution of caustic on top of the mercury into which the copperis dipped, answers the same purpose. When the copper has been properlyamalgamated, for example, in either of the ways mentioned, it is wipedSpecification of Letters Patent.

dry and placed in an appropriate mold. This amalgamated metal is coldwhen placed in the mold which is advantageous because if it wereattempted to place it in the mold hot, the amalgam, or perhaps moreaccurately, the mercury, would be vaporized or oxidized, and one of theessentials is to avoid oxidation. Thereafter the lead is poured into themold upon the amalgamated copper and upon cooling itis found that theunion between the two is extremely perfect and the mercury appears tohave disappeared either by volatilization or possibly absorption by thelead.

What I claim is:

1. The process of making autogenousjoints which consists in amalgamatinga metal, arranging the cold amalgamated metal in a mold, and castingother molten metal into the mold and upon the amalgam.

2. The process of making autogenous joints between lead and copper whichconsists in first amalgamating the copper, placing the amalgamatingmetal while coldin a mold, and casting the lead upon it.

3.. The process of making autogenous joints between lead and copperwhich consists in subjecting the copperto the action of a causticsolution and then dipping it in mercury, wiping the amalgam dry, puttingthe dry amalgamated copper in a mold, and casting molten lead upon theamalgam in the mold, substantially as described.

4:- The process of making autogenous joints between lead and copperwhich consists in first amalgamating the copper and then casting thelead onto the amalgamated copper.

- BRUCE FORD. Witnesses:

Gno. M. HOWARD, L. H. FLANDERS.

Copies 01 this patent may be obtained for five cents each, byaddressingthe Commissioner of Patents,

Washington, D. G.

Patented July 24, 1917. Application filed December 13, 1913. Serial No.806,465.

